Guide means for honing tools



Sept. 5, 1961 G. M. CALVERT 2,998,681

GUIDE MEANS FOR HONING TOOLS Filed Feb. 28, 1958 INVENTOR.

676/1 M (ail 8r??? ELWWQM flfrZ/iy a United States Patent signments, to Jes-Cal Company,'Fraser, Mich., a cor 'pomtion of Michigan Filed Feb. 28, 1958, Ser. No. 718,314 1 Claim. (Cl. 51--184.1)

This invention relates to honing apparatus for honing the bores of workpieces and particularly to improvedguide means for a honing tool equipped with an abrading head carrying a series of radially shiftable annularly spaced abrading elements. The honing apparatus embodying the present invention may be utilized for honing.

dififerentdiameter bores of various types of workpieces. In accordance with the embodiment herein illustrated there is provided mechanism for honing relatively large diameter bores, such as cylinder 'bores, which also present problems in respect to maintaining the workpiece in a true position relative to the honing tool abrading elements.

An important feature of the present invention resides in the provision of a series of guide devices mounted on the abrading head in alternating relation to" the annularly spaced abrading elements, each guide device including a workpiece bore'engaging guide member which maybe readily removed or detached from its guide support so as to facilitate grinding the working surface thereof after wear and restoring it to the correct Jarcuate shape corresponding substantially to the annular shape of the workpiece bore.

tion, although it is understood that this is merely-for illustrative purposes.

In accordance with the present embodiment of the invention the honing tool is provided at its lower end with an abrading head 10 which carries the abrading and guide devices. The abrading head is carried by a lower enlarged end of a tubular shaft or supporting member 11- which extends upwardly from the abrading head. In the present instance the honing tool is provided with a tubu: lar honing tool spindle or spindle member 12 formed at its lower end with a reduced cylindrical portion 12a telescopically received within the upper portion of the tubularshaft 11 and secured thereto against displacement. In accordance with conventional practice suitable mechanism is provided for reciprocating and rotating the spindle 12, shaft member 11 and the abrading or honing tool head 10.

I threads on an adapter ring 14 held in adjusted position In accordance-with-the illustrated embodiment each which is pressed under tension into a recess in the guide a support so as to firmly but releasably hold the guide member in position against displacement during the honing operation. Thus, there is provided a guide member readily removable for truing the outer arcuate working face thereof. Moreover, whenever any of the working faces become under-size, especially relative to one another, a shim may be readily interposed between a guide member and its support so as to ensure correct or uniform diameters of the working faces.

Other objects of this invention will appear in the following description and appended claim, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

FIG. 1 is a view in elevation and partly in section illustrating guide means for a honing tool constructed in accordance with one embodiment of the present invention.

FIG. 2 is an end view taken in the direction of the operating end of the honing tool abrading head.

Before explaining in detail the present invention it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of being practiced or carried out in various Ways. Also it is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitations.

In the drawing there is illustrated a honing tool which is attachable at its driven end to the conventional machine spindle. The honing tool, depending on the type of machine with which it is used, may extend either vertically, or at an angle such as 45, or horizontally. In the present instance the tool is shown in a vertical posiby a set screw 15.

Supported for free lateral floating movement beneath V and in smooth engagement with the bottom surface of ring member 14 is annular sizing means comprising upper and lower size gage ring members 16 and 17 carrying four equally and annularly spaced radially projecting gage members 18. Each gage member is formed with an exterior gaging surface 1'8a tapering upwardly and'outwardly and a tapered lead portion 18b. The varying diameter gage ring means and actuating means (not shown) movable in unison therewith to actuate switch control means (not shown) for initiating cessation of the honing operation may be constructedin accordance with UnitedStates Patent No. 2,820,329. p

The tubular shaft or supporting member 11 carries at its lower end in integral or otherwise fixed relation thereto an enlarged diameter hone body or abrading head 19. In the present instance this hone body is formed with six equally and annularly spaced slots 20 within which are mounted radially shiftable cireumferent-ially spaced abrading members 21. Each member is formed with an outer longitudinally extending recess or groove within which is secured an abrasive strip 22. The hone body is also formed with six guide slots 23 disposed annularly in alternating relation to the slots 20.

Extending Within each slot 23 is a two part guide device comprising a guide support 24 and a detachable guide member 25. Along its outer face each guide member is formed with a central longitudinal slot within which is secured, such as by cement or brazing, a guide insert 26 formed of carbide or other highly wear resistant material. A thrust and locating pin 27 is secured, as by a press fit, within a hole in each guide support 24. This pin has a free fit within a locating hole in the as sociated guide member 25. The hardened locating pins 27 function to absorb longitudinal thrust on the guide members during reciprocation of the abrading tool within the cylinder bore.

Each guide member 25 is removably secured to the associated guide support 24 through the medium of a spring steel clip or snap-in clamping member 28. Each clip is formed with a central flat section or web smoothly engageable with the inner flat face of the guide member 25. This central section is formed at opposite ends with inwardly extending arcuate spring clamping or holding portions 28a. The central elongate flat web of each clip is detachably secured to the member 25 through the medium of a pair of screws 29 having the heads thereof abutting the inner face of the web. The threaded shanks of the screws pass through apertures in the web Patented Sept. 5, 1961 and are threaded into tapped holes 30 in the guide member 25. Each guide support is formed with a recess 31 to receive the clamping member 28. At the entrance to the recess there is formed a relatively short depth annular wall portion 32 which merges into a flaring tapered wall portion 33 of considerably greater depth. The construction is such that the spring clamping portions 28a will be compressed together on forcing them through the aperture formed by the wall portion 32. Thereupon they will expand into relatively tight or firm engagement with the flaring wall portion 33 and will exert a constant force etfwtive to draw the guide member 25 tightly against the support 24 and yieldingly hold it there against disengagement during the honing operation.

It will be seen that any one or more of the guide members 25 may be readily detached or removed from the support 24 thereof for the purpose of truing the outer arcuate working face or surface thereof so as to correspond to the curvature of the surface of the workpiece bore. In the event the grinding of the outer surface of the guide results in its becoming undesirably undersize, particularly with relation to any other guide or guides, such guide may be removed so as to enable removal of the screws 29 and spring clip 28. Therenpon, a size renewing shim corresponding in size to the bottom of the guide may be applied thereto and secured in position by the screws and spring clip when re-assembled as illustrated in FIG. 1. Any such shim interposed at S between the opposed surfaces of a guide 25 and its support 24 will ensure correct diameter of the working face of the guide. Shims utilized for these purposes will vary in thousandths of an inch in thickness depending upon the diameter to be corrected and the number of times after long use this is found to be expedient. It will be understood that the abrading members 21 and guide devices 24, 25 may be controlled and actuated, for example, in the manner illustrated in United States Patent No. 2,790,- 277 or No. 2,790,278.

I claim:

In a honing apparatus having a generally cylindrical hone body formed with a plurality of longitudinal slots therethrough, a plurality of annularly spaced elongated guide member having a plane inner face mating with the plane outer face of its support, said support having inwardly fiaring walls at and defining the ends of said recess, a spring clip having a pair of inwardly curved ends and a central fiat web intermediate said curved ends and smoothly engageable with said plane inner face of said guide member, and threaded means detachably securing said web to said guide member face and removable from said guide member with said clip to permit interposition of a shim between said guide member face and the contiguous face of said support, said clip projecting into said recess with its curved ends releasably engagingsaid flaring recess walls removably to hold said guide member inner face against the contiguous outer face of its support.

References Cited in the file of this patent UNITED STATES PATENTS 298,649 Yingling May 13, 1884 406,509 Fonts July 9, 1889 1,800,609 ZDr-ake Apr. 14, 1931 1,988,193 Edstrorn Jan. 15, 1935 2,070,985 Connor et a1. Feb. 16, 1937 2,312,012 Wallace Feb. 23, 1943 2,695,802 Tegtman Nov. 30, 1954 2,788,621 Doyle Apr. 16, 1957 2,820,328 Calvert Jan. 21. 1958 FOREIGN PATENTS 557,488 Germany Aug. 24, 1932 

